Otavite

Formula : CdCO3

Family: 
Carbonates
Space group: 
Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: R 3c
Dana class: 
14.1.1.7V - 14 Anhydrous Carbonates ; 14.1 Anhydrous Carbonates with Simple Formula A+ CO3 ; 14.1.1 Calcite Group (Trigonal: R3_c)

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
172.419 34.300 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -674698 (Ref.: 91rai/fel) Rai D., Felmy A.R., and Szelmeczka R.W., 1991. Hydrolysis Constants and Ion Interaction Parameters For Cd(II) in Zero to High Concentrations of NaOH KOH, and the Solubility Product of Crystalline Cd(OH)2. Journal of Solution Chemistry, 20, p. 375 390. -752631 (Ref.: Internal calculation) 103.880 (Ref.: 96arc) Archer D.G., 1996. Thermodynamic Properties of Synthetic Otavite, CdCO3(cr): Enthalpy Increment Measurements from 4.5 K to 350 K. J. Chem. Eng. Data, 41, p. 852 858. 89.11 (Ref.: 96arc) Archer D.G., 1996. Thermodynamic Properties of Synthetic Otavite, CdCO3(cr): Enthalpy Increment Measurements from 4.5 K to 350 K. J. Chem. Eng. Data, 41, p. 852 858.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
57.77 116.93 -3.13 (Ref.: 96arc) Archer D.G., 1996. Thermodynamic Properties of Synthetic Otavite, CdCO3(cr): Enthalpy Increment Measurements from 4.5 K to 350 K. J. Chem. Eng. Data, 41, p. 852 858.
Reaction properties

Otavite + H+ ⇌ HCO3- + Cd+2

298.15 K, 1 bar log10K: -1.77 ΔH°r:-13219 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -1.59 -1.77 -2.05 -2.39 -2.83 -3.33 -3.92 -4.69
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-889.254023 -0.143487 48437.631762 322.942585 -2782313.871734